The -P convention

The '-P' convention

Turning a word into a question by appending the
syllable 'P'; from the LISP convention of appending the letter 'P'
to denote a predicate (a boolean-valued function). The question
should expect a yes/no answer, though it needn't. (See T and NIL.)

[One of the best of these is a Gosperism. Once, when we were at a
Chinese restaurant, Bill Gosper wanted to know whether someone would
like to share with him a two-person-sized bowl of soup. His inquiry
was: "Split-p soup?" -- GLS]